What does your plumber/electrician/doctor know that other plumbers/electricians/doctors don’t know and that is the secret of their success?

Forgot about the “no one else” knows part, but the point is being good at something (or knowing something others do not) is not a bad thing, as implied by “insider trading”.

For example, if you figure out a cheaper alternative to lithium, and want to bet that lithium prices will fall as a result of reduced demand, then those are your spoils for figuring that out.

> What does your plumber/electrician/doctor know that other plumbers/electricians/doctors don’t know and that is the secret of their success?

The phone numbers of the people doing construction in my area. Largely through relationships with interior designers and architects.